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  4. The aqueous solution of which of the following salt will have the lowest pH?

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Q. The aqueous solution of which of the following salt will have the lowest pH?

AIIMSAIIMS 1996Equilibrium

Solution:

$ NaClO _{4}$, on hydrolysis, gives strongest acid $HClO _{4}$ as compared to other salts. This is strongly ionized and gives highest concentration of $H ^{+}$. Therefore aqueous solution of $NaClO _{4}$ will have lowest $pH$ value.